hi Mary, if it helps, let me circle two of the questions I see in your post.
1) it's very common for folks to be uncertain about what type of report they want! helpful questions to ask are:
a) what view (types of columns) can the report I'm looking at, show? I don't have the reports memorized, but it might transpire that if you need to see a lot of project or task context, you might start building out a proof report and realize you can't pull in some of the columns you need. If I remember correctly, I think that's a common reason that many people go for a document report instead.
b) how many results do I need? a proof approval report is great if you want to see every single approval request on its own merit. Often, people go for a document report, because they do not want this. The link you posted shows an example of a report that shows you information on multiple proof approval request collected within a single row -- so basically file-by-file now, rather than approval-by-approval.
2) the specific post you linked to -- this contains a further link to a site hosting a "package" where you can download the report and unpack it into your environment, without needing to copy/paste text mode. Please contact Doug @Doug_Den_Hoed__AtAppStore if you are experiencing any problems with this. @Kurt_Jones is also active in the community and if you need access to his text mode, just reach out and message him.